/*
 * Copyright [2013-2017] PayPal Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ml.shifu.shifu.core.dtrain.nn;

import org.encog.neural.error.ErrorFunction;

/**
 * Absolute error computation for gradient.
 */
public class AbsoluteErrorFunction implements ErrorFunction {

    /*
     * (non-Javadoc)
     * 
     * @see org.encog.neural.error.ErrorFunction#calculateError(double[], double[], double[])
     */
    @Override
    public void calculateError(double[] ideal, double[] actual, double[] error) {
        for(int i = 0; i < actual.length; i++) {
            error[i] = Double.compare(ideal[i], actual[i]) < 0 ? 1d : -1d;
        }
    }

}
